Questions Asked on
March 27, 2011

scince
what are the disadvantages of non aqueous titrations
asked by venkataramanaiah 
Chemistry
the type of reaction in a voltaic cell is best described as 1.spontaneous oxidation reaction only 2.nonspontaneous oxidation reaction only 3.spontaneous oxidationreduction reaction 4.nonspontaneous oxidationreduction reaction i know its spontaneous, but
asked by lisa 
Physics
A spring with k=40.0 N/m is at the base of a frictionless 30.0 degree inclined plane. A 0.50kg object is pressed against the spring, compressing it 0.20m from its equilibrium position. The object is then released. If the object is not attatched to the
asked by Anonymous 
chemistry
Using the activity series, write a balanced chemical equation for the following reactions: 1. iron metal is added to a solution of copper (II) nitrate 2. zinc metal is added to a solution of magnesium sulfate 3. hydrobromic acid is added to tin metal 4.
asked by Jessica 
chemistry
What chemical reaction is responsible for the endpoint observed when the NH3/NH4Cl buffer solution is titrated with HCl? Write a blanced ionic equation for the reaction.
asked by redgy 
math
at the end of every 3 months, Rita deposits $100 into an account that pays 5% compounded quarterly. After 5 yrs, she puts the accumulated amount into a certificate of deposit paying 8.5% compounded semiannually for 1 yr. when this certificate matures, how
asked by ash 
lab questions (chemistry)
why must not the condensed water drip into the flask?
asked by felaa 
chemistry
Arrange the following 0.1 M solutions in order of increasing pH and state why you placed each solution in that position: NaCH3COO HCl HCN NaOH NH3 NaCN KNO3 H2SO4 NH4CL H2SO3 NaHCO3 Na3PO4 CH3COOH
asked by Kat 
CHEM102
Ka for hypochlorous acid,HClO is 3.0x10^8. Calculate the pH after 10.0, 20.0, 30.0, and 40.0mL of 0.100M NaOH have been added to 40.0mL of 0.100M HOCl.
asked by Christian 
financial management
The current price of a stock is $33, and the annual riskfree rate is 6%. A call option with a strike price of $32 and with 1 year until expiration has a current value of $6.56. What is the value of a put option written on the stock with the same exercise
asked by katu 
accounting
P202A For the year ended December 31, 2010, the job cost sheets of DeVoe Company contained the following data. Job Number Explanation Direct Materials Direct Labor Manufacturing Overhead Total Costs 7640 Balance 1/1 $25,000 $24,000 $28,800 $77,800 Current
asked by Holly 
Algebra 2
PLEASE HELPDUE APRIL 5TH, 2011!!!! EARTHQUAKES an earthquake rated at 3.5 on the Richter scale is felt by many people, and an earthquake rated at 4.5 may cause local damage. The Richter scale magnitude reading m is given by m = log (base 10) x, where x
asked by Lindsey 
AP Chem
What is the net ionic equation when NaOBr is dissolved in water and the Ksp if the Ksp of the dissocataion of HOBr is 6.4 * 10^6
asked by james 
algebra
Write a function rule for the area of a triangle whose base is 4 ft more than the height. What is the area of the triangle when its height is 6 ft?
asked by thalia 
chemistry
A scientist wants to make a solution of tribasic sodium phosphate, Na3PO4, for a laboratory experiment. How many grams of Na3PO4 will be needed to produce 450 mL of a solution that has a concentration of Na+ ions of 0.700 M
asked by allen 
physics
A uniform electric field of magnitude 320 V/m is directed in the negative y direction. The coordinates of point A are (0.300, 0.450) m, and those of point B are (0.650, 0.300) m. Calculate the electric potential difference VB − VA. thanks
asked by Rachel 
physics help
At a certain location, the solar power per unit area reaching the Earth's surface is 180 W/m2 averaged over a 24hour day. Suppose you live in a solar powered house whose average power requirement is 3.2 kW. At what rate must solar energy reach your solar
asked by sarah 
chemistry
A scientist wants to make a solution of tribasic sodium phosphate, Na3PO4, for a laboratory experiment. How many grams of Na3PO4 will be needed to produce 500 mL of a solution that has a concentration of Na+ ions of 0.700 M
asked by ionic 
physics
A 650g ball on the end of a light rod is rotated in a horizontal circle of 1.2m radius.Calculate the torque needed to keep the ball rotating if the air resistance exerts a force of .02N on the ball. Ignore the moment of inertia and the air resistance of
asked by Mark 
Stoichiometry
if 3.5 mol TiCl4 reacts with 4.5 mol O2, which is the limiting reactant?
asked by Kathy 
chemistry
This is from a "effect of pH on the solubility of Ca(OH)2" lab: If excess Ca(NO3)2 were present, what effect would it have on the solubility of Ca9OH)2? also, in a "effect of comlex ion formaiton on the solubility of NiCO3" lab": If HCl(aq) were added to
asked by redgy 
mechanics
A 60 Kg skier leaves the end of a skijump ramp with a velocity of 24m/s directed 25° above the horizontal. Suppose that as a result of air drag the skier returns to the ground with a speed of 22 m/s, landing 14m vertically below the end of the ramp. From
asked by Anonymous 
physics
A uniform electric field of magnitude 320 V/m is directed in the negative y direction. The coordinates of point A are (0.300, 0.450) m, and those of point B are (0.650, 0.300) m. Calculate the electric potential difference VB − VA. thanks
asked by Rachel 
physics
the polarorbiting environmental satellites (POES) and some military satellites orbit at a much lower level in order to obtain more detailed information. POES complete an Earth orbit 14.1 times per day. What are the orbital speed and the altitude of POES?
asked by victoria 
marketing
47) When segmenting broad productmarkets, cost considerations tend A. To lead to more aggregating. B. To lead to a large number of small, but very homogeneous, productmarket segments. C. To be unimportant as long as the segmenting dimensions are
asked by Anonymous 
maths
If Sin2x=3sin2y then prove: 2tan(xy)= tan(x+y)
asked by saroj 
trigonometry
Write the equation of the curve in its final position: the graph of y = tan (x) is shifted by (pi/6) units to the right, stretched by a factor of 3, then translated 8 units up.
asked by chelsea 
chemistry
lab question: explain why different masses of precipitate were obtained for test tube IV and V?
asked by ekauwen 
Math
A population of 250 frogs increases at an annual rate of 22%. a. Write an exponential function to model the population of frogs. b. Find the population of frogs after 5 years.
asked by Algebra 2. Help, PLEASE! 
calculus
An open box of maximum volume is to be made from a square piece of cardboard, 24 inches on each side, by cutting equal squares from the corners and turning up the sides to make the box. (a) Express the volume V of the box as a function of x, where x is
asked by Anonymous 
Human Relations
Which of the following steps will elicit a meaningful feedback from a passive person? A. confront the person. B. engage in a small talk to fill the uncomfortable empty pauses during a discussion. C. Set time limits. D. Ask closeended questions. I think
asked by Nancy 
physics
what should be the resistance of a heating coil which will be used to raise the temperature of 500 grams of water from 28 degrees celcius to 100 degrees celcius in 2 minutes, assuming that 25% of the heat is lost? the heater utilizes 110 volts.
asked by Anonymous 
mechanics
A 5 Kg marble is fired vertically upward using a spring gun. The spring must be compressed 8.0cm if the marble is to just reach a target 20m above the marble’s position on the compressed spring. a) What is the change ∆U in the gravitational potential
asked by Anonymous 
Physics
With what minimum speed must you toss a 130 g ball straight up to hit the 12 mhigh roof of the gymnasium if you release the ball 1.3 m above the ground? I already figured out the minimum speed, 14m/s I'm confused on the next part With what speed does the
asked by Cam 
physics
An electron moving parallel to the x axis has an initial speed of 4.82 *10^6 m/s at the origin. Its speed is reduced to 1.46 * 10^5 m/s at the point x = 2.00 cm. Calculate the electric potential difference between the origin and that point.
asked by Rachel 
Economics
Anna’s net income is $40,000 per year. What is the most she should spend towards housing each year?
asked by LIssy 
physics
A block of mass 2kg slides down a plane having an inclination of ƒá=15.0„a . Ignore friction. The block starts from rest at the top of the incline and the length of the incline is 2.00m. The velocity of the block when it reaches the bottom of the
asked by hamed 
math
Of the 400 doctors who attended a conference, 240 practiced family medicine and 130 were from countries outside the United States. Onethird of the family medicine doctors were not from the united states. What is the probability that randomly selected
asked by Freakafreak out, please help 
physics
a bullet was fired at a target 50m away with a muzzle velocity of 300m/s. if the barrel of the gun was horizontal, how far below the level of the gun did the bullet strike th target?
asked by mike 
Physics
Initially, mass one (2.10 kg) has a velocity of 5.90 m/s and mass two (2.80 kg) is at rest. After they collide, mass one emerges at an angle theta = 33.0 degrees. What is the speed of mass one after the collision if the collision is completely elastic?
asked by Mary 
chemistry
substance X has a molar mass of 107.6 g/mol. When 2.50 g of substance x burns in an iron calorimeter, the temp. of the calorimeter and the water (2.000 Kg) increases from 25.8 deg. C to 38.7 deg. C. What is the molar heat of combustion of substance X in
asked by carla 
physics
in an experiment using Coulomb's apparatus, a sphere with a charge of 3.6 x 10^8 C is 1.4 cm from a second sphere of unknown charge. The force between the spheres is 2.7 x 10^2 N. What is the charge of the second sphere? I get 1.3 x 10^4 C, but the
asked by Sejul 
physics
At a certain location, the solar power per unit area reaching the Earth's surface is 180 W/m2 averaged over a 24hour day. Suppose you live in a solar powered house whose average power requirement is 3.2 kW. At what rate must solar energy reach your solar
asked by sarah 
stats
sample was obtained from a population with unknown parameters. scores: 6, 12, 0, 3, 4 compute the sample mean and sandard deviation. compute the estimated standard error for M.
asked by T 
physics
A copper wire has a circular cross section with a radius of 3.75 mm. If the wire carries a current of 4.00 A, find the drift speed of the electrons in the wire. (Assume the density of charge carriers (electrons) in a copper wire is n = 8.46 *10^28
asked by Rachel 
math word problems
I don't even know what this means. Please help Five cards are drawn in succession, without replacement, from a standard deck of 52 cards. How many sets of five cards are possible? A. 500 B. 12,994,800 C. 2,598,960 D. 433,160
asked by kacee 
algebra rebus puzzle
What does a diagonal line going from right to left mean? This is a rebus puzzle.
asked by kely 
math
When a square piece of paper is folded in half vertically, the resulting rectangle has a perimeter of 39cm. In square centimeters, find the area of the original square piece of paper.
asked by kristen 
physics
A copper wire has a circular cross section with a radius of 3.75 mm. If the wire carries a current of 4.00 A, find the drift speed of the electrons in the wire. (Assume the density of charge carriers (electrons) in a copper wire is n = 8.46 *10^28
asked by Rachel 
Physics
Initially, mass one (2.10 kg) has a velocity of 5.90 m/s and mass two (2.80 kg) is at rest. After they collide, mass one emerges at an angle theta = 33.0 degrees. What is the speed of mass one after the collision if the collision is completely elastic?
asked by Mary 
rebus
T H R O U G H The TRUG are in bold print. Solve ffor a rebus puzzle.
asked by kely 
math
For the set X={m,n.p,q,r,s}, let R be the relation on P(X) (power set) given by A R B iff A and B have the same number of elements. List all the elements in {m}/R (equivalence class); in {m,n,p,q,r,s}/R. How many elements are in X/R? How many elements are
asked by Pat 
Visual Basic
The rule of 72 is use to make a quick estiment of the time required for prices to double due to inflation. If the inflation rate is (r)percent, then the rule of 72 estimates that prices will double in 72/r years. For instance, at an inflation rate of 6
asked by James Starr 
computer science
When $1000 is deposit at 5% simple interest, the amount grows by $50 each year. When money is invested at 5% compound interest, then the amount at the end of each year is 1.05 times the amount at the beginning of the year. Write a program to display the
asked by James Starr 
English  Native speakers
Hello! Is it correct to say He watches sport on TV or he watches sports on TV. What is the difference?
asked by Mark 
physics
A proton is projected in the positive x direction into a region of uniform electric field E = (6.80 * 10^5 N/C at t = 0. The proton travels 6.80 cm as it comes to rest. (a) Determine the acceleration of the proton. thanks
asked by Rachel 
Math
If you finance $50,000 of the purchase of your new home at 4.40% compounded monthly for 30 years, the monthly payment will be $250.38. If instead your had a rate of 4.80% compounded monthly for 15 years, the monthly payment will be $390.21. How much do you
asked by Shannon 
Physics
Find the speed at which Superman (mass=88.0 kg) must fly into a train (mass = 17998 kg) traveling at 60.0 km/hr to stop it. Running into the train at that speed would severely damage both train and passengers. Calculate the minimum time Superman must take
asked by Daniel 
Chemistry
I'm trying to calculate the enthalpy of the reaction Mg(s) + 2HCl(aq) > MgCl2(aq) + H2 (g) however I cannot find the enthalpy of the compound MgCl2 (aq) and I cannot calculate the total enthalpy without it
asked by Kirstie 
economics
Consider an economy with the production function L^(1/3) a) Derive the Labor demand Curve b) If Labor supply curve is L^s= (w/p), calculate the equilibrium levels of real wage, labor and output. c) Assume M^s= 45 and k=3 . What is the equation of the
asked by josh 
Math
A population of 250 frogs increases at an annual rate of 22%. a. Write an exponential function to model the population of frogs.
asked by Algebra 2. Help, PLEASE! 
chemistry
If you have 200.0 mL of a 30.0% aqueous solution of isopropyl alcohol, what volume of water is in the solution?
asked by leilah 
Physics
A motorist driving a 1200kg car on level ground accelerates from 20.0 m/s to 30.0 m/s in a time of 5.0s. Neglecting friction and air resistance, determine the average mechanical power in watts the engine must supply during this time interval.
asked by Anonymous 
Chemistry
A chemist mixes 100ml of H2O at 30 degrees Celsius and 56.0g of CaOin a calorimeter. The following reaction occurs" CaO(s) +H2O(l)>Ca(OH)2(s) ΔH= 16.0 kcal/mol The heat capacity Ca(OH)2(s) is 19.2 cal/mol*degreeCelsius and the heat of vaporization of
asked by Kim 
economics
What is the face value of a municipal bond that has a bond (or coupon) interest rate of 6% per year and makes interest payments of 578 dollars every 1 months?
asked by Rachel 
math
Ben rolls a standard number cube (sides labeled with numbers 1 through 6). Find the probability that Ben rolls a number greater than 2 or an even number.
asked by please help...thank you 
English
1. What do you not like doing? 2. What don't you like doing? 3. What do you hate doing? 4. What do you dislike doing? I don't like doing computer games. (Which questions are commonly used? Are all grammatical?)
asked by rfvv 
physics
an .18 kg is placed a compressed spring on the floor. the springs exerts an average force of 2.8N through a distance of .15m as it shoots the ball upward. how high will the ball travel above the release spring?
asked by Anonymous 
Chemistry
Calculate the pH after 0.10 mol of HCl is added to 1.00 L of the solution that is 0.57 M HF and 1.13 M KF. I got 3.01, but it is wrong. What did I do wrong?
asked by Mary 
physics
An electron moving parallel to the x axis has an initial speed of 4.82 *10^6 m/s at the origin. Its speed is reduced to 1.46 * 10^5 m/s at the point x = 2.00 cm. Calculate the electric potential difference between the origin and that point.
asked by Rachel 
chemistry
A 20.1 mL sample of a weak monoprotic acid, HX, requires 50.0 mL of 0.060 M NaOH to reach the equivalence point. After the addition of 30.0 mL of NaOH, the pH is 4.90. What is the Ka of HX?
asked by Anonymous 
linguistics
Question Consider the following sentences: (a) River Song is an archaeologist from the future. (b) River Song has a screwdriver. Based on these two sentences, which of the following is true? A. (a) entails (b) B. (b) entails (a) C. (a) entails (b) and (b)
asked by Marcella 
PreCalc
The sun rises at 6 AM and is directly overhead at noon, estimate the time (hour and minutes) when a 34foot tree will have a 14foot shadow.
asked by Sam 
english
Every now and then, instead of using email, mail a letter to your grandparents. We live in a fastpaced world. We feel comfortable using computers to send emails and Instant Message. Nana doesn’t live in that time zone. Forget all those fancy fonts and
asked by Greg 
rebus puzzle
I need a good rebus sit to help sove some rebus puzzles. thanks!
asked by joe 
Chemistry
At a particular temperature, K = 3.75 for the following reaction. SO2(g) + NO2(g) SO3(g) + NO(g)\ If all four gases had initial concentrations of 0.550 M, calculate the equilibrium concentrations of the gases.
asked by Amber 
chemistry
The amount of 2.00 mol of a solid ionic compound was dissolved in 225 mL of water in an insulated container. The initial temp of water was 20 deg. C and the final temp. was 47.8 deg C. What is the delta heat Dissolution? Assume the heat absorbed by the
asked by carla 
algebra
y^414y^3+49y^2 y^2(y^214y+49) y^2(y7)^2 if you solve a problem like this ^ then how do you solve this: x^24x+4 ?????
asked by gena 
Physics
A particle with a mass of 2.0×10−5 kg and a charge of +2.0 microC is released in a (parallel plate) uniform horizontal electric field of 13 N/C. If the plates are 5.6 cm on each side, how much charge is on each? (in pC) From what I have so far, the
asked by Ben 
Chemistry102
What is the pH obtained by mixing 50.00mL of 0.100N HOAc (acetic acid) and 25.00mL of 0.200N NaOH?
asked by Christian 
CHEM102
Calculate the pH of a solution prepared by mixing 10.00mL of 0.50M NaOH and 20.00mL of 0.50M benzoic acid solution. (Benzoic acid is monoprotic; its ionization constant is 6.7x10^5).
asked by Christian 
physics
A proton is projected in the positive x direction into a region of uniform electric field E = (6.80 * 10^5 N/C at t = 0. The proton travels 6.80 cm as it comes to rest. (a) Determine the acceleration of the proton. thanks
asked by Rachel 
MAth
1/2ln(x+3)lnx=0
asked by Meredith 
Spanish7th gradePlease check
I use spanishtypeit to do accents so I just said after phrase where I would have put the accent markthank you for checking 1.¿Cuál es tu deporte favorito? Mi deporte favorito es al golf. 2..¿Te gusta navegar en el internet? Si, me gusta navegar en el
asked by Shelley 
physics
A hunk of cast concrete with a weight of 10 N will float if it displaces 10 N of water.
asked by aaron 
algebra
Dertermine whether ech binomial is the difference of two squares, If so, factor it, if not explain why? m^6 36s^24t^2 9b^4200 x^216 x^2y^2+196
asked by bianca 
math
Find an equation of a polynomial function of degree 5 with integer coefficients with zeros 0, 2, and 1/2.
asked by Dan 
Composition (Intro Paragraph)
I would like to get a little feedback. I had to write an introduction paragraph of at least 250 words that includes a thesis sentence stating how and why the specific work is more than just a piece of entertainment. The thesis must relate why it is a
asked by Jim 
Geometry
I need to get the largest area of 100 feet of rope. I want to say rectangle: 40L x 40L x 10w x 10w =100 Please advise if I am on the right track. Keeping in mind that you can use any Plan Geometry Shape?
asked by Jeannie 
math algebra
If a pro basketball player has a vertical leap of about 25 inches, what is his hang time? Use the hangtime function V=48T^ I am having major problems here!!! I need help.
asked by tracie 
Physics
A radioactive nucleus is at rest when it spontaneously decays by emitting an electron and neutrino (as shown in the figure below ). The momentum of the electron is 8.11 x 10−19 kg·m/s and it is directed at right angles to that of the neutrino. The
asked by Tom 
Math
A 30m tall flag pole and its shadow form the sides of a right triangle. On this particular day, the sun rises at 6 AM and sets at 6 PM. At what time of the morning (to the nearest minute) will the length of the shadow be exactly 40 m? (Hint: determine the
asked by Cara 
biology
Sex is not always a fixed characteristic of an organism. There are a variety of sex switching organisms as well as hermaphrodites who act as either male or female depending on the circumstances. How can we understand the behavior surrounding these
asked by Mike 
physics
The density of a solid ball with a mass of 231 g and a volume of 110 cm^3 is ____ g/cm^3.
asked by aaron 
Calculus.
Given the function f with the restricted domain, find the points at which the tangent line is horizontal. f(x)=2sec(x)tan(x) Domain: [pi/2,pi/2] * I got (pi/6, square root of 3), but I am not sure if that is right, or if there is another point.
asked by Ashley 
Physics
An inexperienced catcher catches a 128 km/h fastball of mass 134 g within 1.01 ms, whereas an experienced catcher slightly retracts his hand during the catch, extending the stopping time to 10.1 ms. What is the average force imparted to the two gloved
asked by Mallory 
math
An executive committee of three is selected from a group of ten. Which expression best describes the number of combinations? These are my choices. I have to have one of these as the answer. I am stuck. My answer was B. 10!, but I am still not sure. Can
asked by lulu 
Math
ln(x+3) + ln(x+4) = 3ln2
asked by Connor 
center of mass
3 point mass of 4g placed at x=1,3,6. where should a point fourth mass of 4 gm be placed to make the center of the mass at the orgin? this what i got : 24+4+12+4x/16=8+4x/16. this what i did but i didn't get the right answer(which is 2) can someone tell
asked by lou 
chemistry
Substance x has a molar mass of 107.6 g/mol. when 2.50 g of substance x burns in an iron calorimeter the temp. of calorimeter and water (2.000Kg)increases from 25.8 d Celsius to 38.7 d celsius. What is the molar heat of combustion of substance x in kJ/mol.
asked by carla 
math
Stanwood Builders has a development of new homes. There are five different floor plans, four exterior colors, and an option of either twocar or threecar garage. How many choices are possible for one home? A. 60 B. 40 C. 20
asked by mika 
math
If the cost of a cell phone has decreased 400% during the past 10 years, does that correspond to a decrease of four times?
asked by Mary 
math trivia
larry has 3 children. the product of their ages is 36 and the sum of their ages wont help you. the youngest is blonde. how old are the children? this is a "fun" math activity? help!! :)
asked by dawn 
rebus puzzle
What do the letters LIF mean They are written large and I need to solve for a rebus puzzle?
asked by kely 
Math
A company contributes $170 per month into a retirement fund paying 4.20% compounded monthly and employees are permitted to invest up to $ 2,800 per year into another retirement fund which pays 4.20% compounded annually. How large can the combined
asked by Megan 
mathcombinations
An executive committee of three is selected from a group of ten. Which expression best describes the number of combinations? A. 10P3 (small 10 and 3) B. 10! C. 3P10 (small 3 and 10) D. 10P3/3! (small 10 and 3 on top, big 3! on the bottom)
asked by eryn 
REBUS PUZZLES
I need help with some rebus puzzles please. T H R O U G H The letters TRUH are in Bold color. E OV RRAT D E
asked by joe 
physics
A proton moves at 3.60 *10^5 m/s in the horizontal direction. It enters a uniform vertical electric field with a magnitude of 8.20* 10^3 N/C. Find the time interval required for the proton to travel 4.00 cm horizontally. thanks
asked by Rachel 
eth 125 week 1
Select one of the following subordinate groups from Ch. 1 of the text, or, because the chapter does not list all subordinate groups, you may select any other group that has a documented history in the United States. Do not select your own ethnic group! o
asked by latisha 
business
The conceptual framework developed by the Financial Accounting Standards Board
asked by ELAINE 
Physics
A radioactive nucleus is at rest when it spontaneously decays by emitting an electron and neutrino (as shown in the figure below ). The momentum of the electron is 8.11 x 10−19 kg·m/s and it is directed at right angles to that of the neutrino. The
asked by Tom 
Physics
A sled of mass 5.98 kg is coasting along on a frictionless icecovered lake at a constant speed of 1.42 m/s. A 1.98kg book is dropped vertically onto the sled. At what speed does the sled move once the book is on it?
asked by Amber 
Algebra 2
PLEASE HELP WITH THISITS DUE APRIL 5TH, 2011!!! During a past epidemic, the number of infected people increased exponentially with time, or f (t) = ab^t , where f is the number of infected people at time t, in days. Suppose that at the onset of the
asked by Lindsey 
physics
A bar made of a particular metallic alloy has a length of 10 cm at a temperature of 24 oC and a length of 10.015 cm at the boiling point of water. (a) If a second bar made of the same material were 10 m at 24 oC, how much longer would this bar be at the
asked by kelly 
Reading
Experienced superhighway drivers know the importance of staying behind or ahead of what some people call wolf packs – several fastmoving vehicles bunched together. Wolfpacking can be the cause of highspeed fatalities. This passage was probably
asked by Arlynn 
physics
The terminal velocity of a 4×10−5 {\rm kg} raindrop is about 9 {\rm m/s}. Assuming a drag force F_{\rm{D}} =  bv, Assuming a drag force determine the value of the constant b.
asked by aidan 
Chemistry
The calcium in a 150 mL sample of water from the Ogeechee River at a location near Savannah was determined by precipitating Ca2+ as CaC2O4.H2O (FW=146.115 g/mol). The precipitate was collected by filtration, washed and then ignited [turning the CaC2O4.H2O
asked by Anonymous 
algebra II
Find the payment necessary to amortize the loan. 11) $ 1500; 6% compounded annually; 7 annual payments 11) _____ A) $ 271.33 B) $ 241.55 C) $ 305.05 D) $ 268.70
asked by Lin 
Chemistry
In the classroom, we reacted Mg(s) + 2HCl > MgCl2(aq) + H2 (g) (0.31 g of Mg(s), and 99.46 g of HCl) Initial temp. = 22.5 celsius, max. temp. 36.0 celsius and MgO(s) + 2HCl > MgCl2(aq) + H2(g) (1.00 g of MgO(s) and 97.71 g of HCl) Initial temp. 22.0
asked by Kara 
Statistics and Probability
Suppose you took 1000 random samples of size 200 from the Poisson distribution with u = 5 and computed a 90% confidence interval for each sample. Approximate the probability that at least 920 of these intervals would contain the mean value u = 5. Be sure
asked by Adam 
Math
Bank A is offering an interest rate of 6.60% compounded monthly, while bank B is offering an interest rate of 6.67% compounded quarterly. The effective rate offered by bank A =?%, while the effective rate offered by bank B = ?%.
asked by Tracy 
REBUS PUZZLES
These letters are written in large bold print. LIF Next puzzle: A bold diagonal line going from right to left.
asked by joe 
Economics
“The strength of the GDP data only highlighted the diverging views between the dollar bulls, who predict that strong growth will support the currency, and the bears who warn that stronger growth will only serve to widen the current account deficit and
asked by CLA 
calculus
find the area of one of the regions bounded by the curves y=sin x and y=cos x
asked by monday 
French
i need help on my french test tomorrow... i have no idea what to study... please help me!!
asked by Brithni 
Chemistry
What is the chemical formula for this compound? sodium diamminetetrachloroplatinate(IV)
asked by George 
biology
The ability of a forager to find food is often related to the ability of the forager to make decisions in the face of imperfect information about its environment. Discuss the effect that imperfect information has on foraging decisions.
asked by Mike 
calculus
use antidifferentiation.... and find (1/the square root of 2x)dx
asked by Anonymous 
Algebra
Solve the proporttion 32/X = 2/3 32 + 2 = 16 3 + Please help
asked by Jeannie 
chemistry
plan and design an experiment which would allow you to find the percentage by mass of copper in a sample of impure copper
asked by kim 
linguistics please!!!
1. (a) Mary murdered the platypus (b) Mary killed something Select a maxim that is being flouted in this conversation. A.Quantity B. Manner C. Quality D. Relevance 2. Bob: Do you want to grab a cup of coffee sometime? Sally: Sure! I absolutely love
asked by Marcella 
microsoft exel help
Suppose that cell B2 contains the budgeted amount and cell C2 contains the actual amount. Write the formula (including the IF conditions) that would insert the word under if the actual amount was less than the budgeted amount and insert the word over if
asked by Anonymous 
physics
what is the prarticle diagram for the thermite reaction?
asked by maya 
Economics
“Many countries peg their own currencies to the greenback; these countries import U.S. inflation when the Fed makes a mistake.” Why would these countries “import” inflation. A. this is incorrect because countries only import goods or services B.
asked by CLA 
Social
Hi, I'm making a cartoon about capitalism for my class (34 slides). The concept I want to talk about is how capitalism allows people to own land and invest in their own capital. I'm not sure what the air bubbles to say, since it says should be short yet
asked by Jon 
algebra
graph 3x+5y= 15 using the slope and yintercept.
asked by Anonymous 
chem 100
how many moles of magnesium hydroxide are needed theoretically to neutralize 2.4 moles of hydrochloric acid?
asked by sarah phillips 
UOP
help solving 4c divided by 2c minus 4 plus 2c divided by 4c minus 8
asked by Glenda 
chemistry
how do you calculate the mass of water that will be produced when 5.0 grams of H2 is reacted with excess O2?
asked by megan 
chemistry
The beaker contains 0.3000 M HCl and the buret contains 0.3000 M NaOH. Write a complete balanced equation for the neutralization reaction between HCl and NaOH.
asked by Kat 
math
prove that a triangle with the sides given by x^2 + 1, x^2 – 1, and 2x will always be a right triangle for x > 1, using pythagorean theorem
asked by Anonymous 
Geometry
Ok a Circle is 360 degree and the 100 feet of rope the how do I get the radius and or diemeter? I keep getting 6.283185307 as the radus but it does not seem right.
asked by Jeannie 
3rd grade math
16 1/2 x 33 = is it 792
asked by Sharon 
Maths
Whats the difference?count from 220 to 203 How many is that?
asked by Kinga 
math
define the concept of sampling error
asked by pat 
Computer sciences
Hello ... In 256PSK, how many bits will each symbol be able to represent? My answer is 8. is it correct? or could it be just ONE bit ? Advice appreciated ... and thank you Boobooo
asked by Booboo 
English
Can you please check these last questions. Thank you very much!! 1) What are the most dominant themes in Shakespeare’s Macbeth? 2) How does Shakespeare define True Love in his famous sonnet The Marriage of true Minds? 3) What do the three witches stand
asked by Mike 
science
Eukaryotes have a membrane bound nucleus that contains ______________ genetic material
asked by Anonymous 
English
I forgot to include the following sentences.Thank you very much. Sentence number 6 is very long because I included different possible alternatives. 1) I think you should tell Paul's parents that he steals things. You should talk to him before reporting him
asked by Mike 
7th grade math
what is an equation?
asked by holiday 
french
Hi, if I want to say: I will go to China, Greece, and Egypt. ...would this be correct?: J'irai en Chine, la Grece, et l'Egypte. Or would I just list them? Thanks!
asked by kat 
Critical Thinking
Which of the following illustrates the key difference between subjective and nonsubjective issues?
asked by Pete 
physics
THERE ARE 10 WAYS TO DRAW A CIRCUIT WITH FOUR 5OHM RESISTORS. WHAT ARE THEY?
asked by KARA 
geometry
a rectangle and an equilateral triangle have the same perimeter the length of the rectangle is 4 times its width the length of each side of the triangle is 55 centimeters what is the length,in centimeter of the triangle
asked by tamara 
evolution
briefly describe the evolution of movies, television, Internet, books and magazines, and media companies throughout the last century.
asked by Anonymous 
math
use >
asked by cindy 
chemistry
what is the molarity of the Cl ions at the stoichiometric point
asked by Amanda 
Calculus
The Problem: The spherical top holds a little over 54,000 gallons of water. The base of the top is 60 feet above the ground. The diameter of the supporting column is onethird the radius of the sphere. The base of the supporting column flares out like a
asked by Zach 
geometry
ms. p gave us a ? that was a right angle triangle & 1 side was "15ft" and the other side was"9ft".then she told us the answer was "67ft" and she told us we had to figure out how she got the answer.
asked by ms. mysterious 
English
I left out these last three sentences. I hope you can have a look at them, too. 1) I think you should tell Paul's parents that he steals things. You should talk to him before reporting him to the police. 2) I think you should wait till your birthday or
asked by Mike 
physics
You are driving a car with a power output of 56,000 Watts. How many seconds will it take to go from 0 m/s to 27 m/s?
asked by Savannah 
Biology  The Stomach
When referring to the lumen of the stomach is that just the opening. As in where are the HCl is and where your food enters? I googled the definition of lumen and it says inside space. I'm just not too clear on what it really means. Thanks.
asked by Lena 
Chemisrty
I need help on what exactly to put on 1012 slides on a pwoerpoint of anders celsius?? (for 2m)
asked by Tiara 
English
Can you please check these sentences for me? Thank you. I'm unsure about using phrasal verbs in a context. 1) She is thinking of dropping out of school. She doesn't know if she'll be able to deal with her problem by herself. 2)She doesn't like talking
asked by Mike 
algebra
can anyone help me one this 4x(x4)5x(x3)=0 solve for x
asked by scott 
science
what is the indepenpent variable when i make a home made lava lamp
asked by iliana 
Calculus
What is the limit of: x^5+2x^4x^2+1?
asked by Deanna 
mathematics
a box contains 2 white and 3 blue balls.two balls are picked at random,one after the other without replacement.what is the probof picking two balls of different colours?
asked by tobi 
math
How many ways are there to write 7 element data lists of integers in # order with Median 21, mean 20 range 10 and the Mode 22 and what are they?
asked by astin 
linguistics
For the following: (a) John is angry because Mary murdered the platypus (b) Mary murdered the platypus The answer: A. (a) entails (b) B. (a) presupposes (b) C. Both
asked by Marcella 
LINGUISTICS
Question Consider the following sentences: (a) River Song is an archaelogist from the future. (b) The number 7 is even Based on these two sentences, which of the following is true? A. (a) entails (b) B. (b) entails (a) C. (a) entails (b) and (b) entails
asked by Marcella 
Geometry
What is the equation that passes through the points (4,0) and (8,12) A: y=6/5x+4 B: y=x+4 C: y=8/3x+4 D: y=x4
asked by Dartha 
chemistry
Does the solution's acidity increase or decrease as potassium hydroxide is added to the solution? Explain your answer.
asked by Tasha 
Biology
What will happen to a turgid plant cell with an initial water potential of 0.5 MPa when dropped into a large beaker of water and solute that has a water potential of 1.5 MPa?
asked by Leslie 
algebra
Find an equation of a polynomial function of degree 5 with integer coefficients with zeros 0, 2, and 1/2.
asked by Dan 
algebra
how to: graph, substitution, and elimination y=3x+4 12x+4y=16
asked by wilma 
Biology
Sorry for reposting but I really need help with this question and I've waited several hours. What is the trigone of the bladder bounded by? a) top of fundus and uretal orifices b) major and minor calyces c) orifices of ejaculatory ducts and urethra d)
asked by Lena 
PreCalculus
How would you find the limit of (an + bn) when an=2 and bn=16? Or just how to find limits in general?
asked by Court 
physics
Your spacecraft is in a circular, geostationary orbit around earth and you would like to fly to the moon. Draw a suitable Hohmann transfer orbit that will get you there. How long does the journey take? (Neglect the gravitational fields of the moon and the
asked by john 
Economics
“On a net basis, foreigners sold a record $22 billion of longterm Treasury debt in November. A repeat performance would fuel market nightmares about _______ Treasury rates and a _______ dollar.” The blanks are best filled with A. falling; rising B.
asked by CLA 
Physics
A closed organ pipe 0.8 m long has a diameter of 7.0 cm. The air in the church is 15oC. What is the fundamental frequency? If the heat is turned up to 20oC, what is the new fundamental frequency?
asked by Kiyah 
Math
lnx+ln(x+3)=2
asked by Laura Grace 
Math
A normal cake is divided into the maximum number of pieces, p, by c slices. When c = 1, 2, 3, 4, 5, and 6, the cake is divided into 2, 4, 8, 15, 26, and 42 slices respectively. What is the maximum number of pieces into which the cake can be divided when it
asked by Hermione 
physics
A proton moves at 3.60 *10^5 m/s in the horizontal direction. It enters a uniform vertical electric field with a magnitude of 8.20* 10^3 N/C. Find the time interval required for the proton to travel 4.00 cm horizontally. thanks
asked by Rachel 
chem
im studying for a test and i have no idea where to even start for this practice problem..?? a 0.15M(molarity im assuming)solution of BrCl2 contains.. a).15MBr2+ ions and .30M Cl ions b).30MBr2+ ions and .15M Cl ions c).15MBr2+ ions and .15M Cl ions
asked by hannah 
Physics
A tennis ball of mass 0.0609 kg is served. It strikes the ground with a velocity of 52.5 m/s (117 mi/h) at an angle of 22.0° below the horizontal. Just after the bounce it is moving at 50.5 m/s at an angle of 17.7° above the horizontal. If the
asked by Rob 
Trigonometry
A rectangular box shown has dimensions 10" multiplied by 6" multiplied by 4" (a = 10, b = 6, c = 4). Approximate the angle theta formed by a diagonal of the base and a diagonal of the 6" multiplied by 4" side. (Give the answer to two decimal places.)
asked by Anonymous 
english
Janet left fingerprints on the glass, the detectives were able to solve the crime
asked by tammy 
MAth Im stuck on question can anyone help me ?
Im stuck on this question can anyone help me ? I thought it was b but that's wrong Which situation can be modeled by tossing a coin 3 times A)choosing which one of sixteen teams will win a tournament? B)picking one of six math teacher, C)decide which
asked by Mikah 
Social
Hi, I have to draw a cartoon 34 slides about capitalism and put like air bubbles with people talking. I was wondering if you have any ideas what the conversation could be about?
asked by Jon 
calculas
caluclas (intersection of three planes) HELP!!!? in the equations k is a real number 1.x2y+z=4 2.xyz=3 3.x+y+kz=1 for what values of k does the system 1.have exactly one solution? 2.have an in finite number of solution?
asked by ram 
physic
How long will a radio wave, with a wave length of 200 m takes to travel to and for the moon from the earth? (Distance of moon from earth = 3.9 x 108 m)
asked by yumina 
Physics
the weight of an object changed by =25.0% the object's final weight was 2.5 grams. What is it's inital weight
asked by Kia 
MathPLEASE help!!
An executive committee of three is selected from a group of ten. Which expression best describes the number of combinations? These are my choices. I have to have one of these as the answer. I am stuck. My answer was B. 10!, but I am still not sure. Can
asked by lulu 
7th grade math
2x+7=4x+3 ? 3x+6=5x+1 ? 2n+6=8N+3 ? 6N+9=9n+6 ?
asked by holiday 
Please help. Thank you!
There are 6 people in a gardening club. Each gardener orders seeds from a list of 11 different types of available seeds. What is the probability that at least 2 gardeners order the same type of seeds?
asked by Freakafreak out, please help 
History
Were Athen boys forced to serve in the army?
asked by Ann 
chemistry
What is the percent yield of the mass of water that will be produced when 5.0 grams of H2 is reacted with excess O2 if 40. g of water are actually recovered?
asked by megan 
7th grade math
what is an equation?
asked by holiday 
biology
In a species, there are usually equal numbers of males and females and occasionally not. Furthermore, parents bias investment to male or female offspring. Discuss the relation of these phenomena.
asked by Mike 
Math
In a science fair experiment, 2 units are selected for testing from every 500 units produced. How many ways can these 2 units be selected?
asked by Austin 
MATH
What tool do i use to find the measurement of the classroom floor.
asked by Keisha 
science
what might happen to pastry dough that doesn't include enough water?
asked by mackenzie 
english
what does this quote mean "We'll have to tighten the belt a little bit and make due"
asked by kate 
English
I included the five sentences I was most unsure of. Thank you for helping me. It's really urgent. 1) I was very proud of myself when I won a (the) regional rollerskating competition in 1998. (when I scored 4 goals one after the other/when I headed the
asked by Mike 
Public Finance
The cost of hiring a secuirty guard to patrol the neighborhood of a community is 300 per week Assuming that the marginal benefit of the first secuirty guard is 100 for each of the ten (n=10) individuals living in the community what is the optimal outcome
asked by kilolo 
computer sciece
The change in memory density with time can be described by B=19.97*10^10.1977(year 1960).If a straight line projection is mode using this equation, what will be the number of memory chips/bits in the year 2020?
asked by Cathy 
computer/internet
LTE vs 3G and HSPA?
asked by jake 
physics
Muons are elementary particles that have a very short lifetime of about two millionth of a second (when at rest). They can be created in the upper atmosphere (at an altitude of say 10,000 meters) by cosmic rays, in which case they travel towards the
asked by john 
Algebra
use FOIL (2x^56)(x^63) My answer is 10x^2218...but I am not sure that is right. Could someone please help.
asked by Jake 
math
simplify and state the restrictions of a^2 9b^2 / 5a^211ab12b^2
asked by ali 
Math
Just for reference √ = square root Evaluate the following expressions: a) 3√12  7√75 b) 1 3/5 + 4/15 c) 3 + (5) +3 (5) d) 3y+6/4  y3/2 = 3y/4
asked by Alicia 
chemistry
when copper sulphide is heated a new product is form in white colour plz explain me the whole process..
asked by fatiii 
algebra
the perimeter of a rectangle is 82m. the length is 2m ore then twice the width. what is the dimensions?.
asked by bianca, pleeease help i'm lost 
chemistry
why must a clean rod be used each time?
asked by fel 
grade 9 polynomials
7 (r+3s)  2(2r 9s) I am having a hard time solving can anyone please help
asked by brooke 
math
you have a $5841 credit card debt, and you plan to pay it off through monthly payments of $71. if you are being charged 14% interest per year, how long will it take you to repay your debt?
asked by ash 
social studies
The knights role and fall of feudalism
asked by Mary 
Chemistry
Calculate the pH after 0.13 mol of NaOH is added to 1.00 L of the solution that is 0.57 M HF and 1.13 M KF. I got the answer of 3.66 to 3 sig figs, but it's wrong. Can you please tell me what I did wrong? Thanks
asked by Katrina 
Geometry :(
What is the equation for a line that passes through the points (3,3) and (6,15)??? A: y=2x+9 B:y=2x3 C:y=2x+3 D:y=2x9 Please please help and thanks :)
asked by Makenzie;) 
grade nine polynomials
(3/4) (1/2) + (5/6) (1/3)
asked by brooke 
algebra
how to: graph , substitution, and elimination y=2x+5 y=2x8
asked by karen 
algebra
convert to decimal 8.93x10^7
asked by margie 
algebra
5ã1/1024
asked by margie 
Linguistics
1) (A) Mary murdered the platypus (B) Mary killed something Is the answer: (a) entails (b) OR (a) presupposes (b) OR both 2) (A) John is taller than Mary (B) Mary is shorter than John Is the answer: (a) entails (b) OR (a) presupposes (b) OR both
asked by Marcella 
current events
I;ve been looking around for a long time on the internet and i cannot find cureent republicans view on k12 education and how they differ from democrats. someone please help. thankyou/
asked by Anonymous 
math
The number of pages in tony's book is the quotient of the number of pages in Monique's book and four, increased by one. if m repesents the number of pages in Monique's book, write an algebraic expression for the number of pages in tony's book
asked by mecca 
math
the number of puppies is 3 more than twice the number of kittens in the canal. if there are k kitten in the canal write an algebra expression for the # of puppies in the canal
asked by mecca 
English
Thank you very much. I forgot to include the following sentences. 1) Refer to situations in which robotic planes have proved to be useful. 2) Which scientific methods does forensic science adopt to catch potential criminals? 3) What/Which skills are
asked by Mike 
Biology GI Tract
I have a question regarding the gastric wall. Do the epithelial cells of the mucosa secrete substances directly into the lumen or do they secrete into the gastric pits then then from there the substances go into the lumen?
asked by Lena 
math
pivot the system about the element in row 2, column 1: 5 5 l 7 10 4 l 4
asked by Leah 
math
(x/4−1/x)/(1/2x+1/4)
asked by amber 
PreCalc
300=5000^e*.3x
asked by Linda 
Calculator help
can someone tell me how to graph this equation on my graphing calculator: 300(2+sin(4sqrt x+0.15)) for 0
asked by tony 
chemistry
there are __ reprensentative particles in a mole of any substance
asked by Anonymous 
psy202
contrast 2 theories or perspectives from late stage adult development?
asked by elley 
psy202
identify how each approach informs or impacts your life,particularly as you prepare for your senior years?
asked by elley 
algebra
help solve x^+184=0
asked by sam 
math 117
a^5a36=0 can anyone help me on this??
asked by austin 
french
on regarde le match?  on marche sur la corniche?  on parten voiture?  on va aila tour du caire?  je fais une excursion au fayoum?  nous
asked by hana 
Math
How do you know how many units are spread between the intervals? (For instance, 120129, 130139, units spread by 10) How would we answer this question? Thirty AA batteries were tested to determine how long they would last. The results, to the nearest
asked by Jacob 
math
how many different ways can you pick 2 objects from a set of 7 objects?
asked by kaykay 
Science
8 points how the gravitational acceleration(g) is used to benefit mankind and the enviroment
asked by Siza 
Biology  GI Tract
I have a question about Vit B12. Where is it absorbed in the body? In lecture, the professor stated once that it's absorbed in the small intestine and then later stated it was the large intestine. I'm thinking small intestine makes more sense but I'd like
asked by Lena 
algebra 2
how do i graph: y(less than or equal to)6ãx
asked by courtney 
math
What is the union of x and y? X. (3,6,9) Y. (5,10,15)
asked by kyle 
math
Consider the polynomial x^3 + 6x^2 + 3x  10. Without dividing, or graphing, which two of (x+2), (x2), (x+1), and (x1) must be factors of the polynomial? Why/how do you know?
asked by Dan 
human services
What are some possible obstacles that are preventing resolution of unmet needs of those with disabilities?
asked by =) 
Math
how will u write 27th March 2011 in 5letters without using numbers.
asked by Nilesh 
physics
what will happen if we suspend a brick with a newton metre in water
asked by Anonymous 
Math ( calculas)
find the intervals on which the curve y=x/(x+1)^2 is concave upward or concave downward.
asked by Tina 
Math
how do i solve 2q/(2q+3)2q/(2q3)=1
asked by Marylyn 
Math 117
subtract and simplify if possible 4z  8z5 = z2 2z not sure if i got this typed right thank you for anyhelp you may give
asked by Traccy 
psy202
discuss the benefits(pros) and short comes (cons) of each perspectives?
asked by elley 
math
solve in factored form 3x^8  27x^7 + 21x^6
asked by james 
Geometry :]
What is the equation for a line that passes through the points (2,1) and (4,4) A: y=1/2x+2 b: y=1/2x+2 c: y=1/2x2 d: y=1/2x2
asked by Dartha 
Calculus.
What is the derivative of [(3t+4)/(6t7)]^3?
asked by Matt 
math
is a rec. a square explain your answer
asked by cindy 
Biology  GI Tract
In my notes it says that the last 2/3 of the esophagus is controlled by smooth muscle (controlled by ANS and ENS). What is ENS? I'm listening to the lecture the it's something nervous system but I have no idea what the E stands for.
asked by Lena 
probability and statistics
plot the following straight lines y =60 + 8x and y = 300 6x
asked by dianne grant